KIP-1244 — Drop support for streams-scala in Kafka 5.0 (deprecate in 4.3)

Accepted Kafka 4.3 Streams

Deprecates the streams-scala module in Kafka 4.3 and removes it in 5.0. Usage data shows only ~1.3% of Kafka Streams developers use the Scala wrapper, and the module duplicates the entire DSL API surface in Scala, creating a significant ongoing maintenance burden with minimal community benefit.

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